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nsec3param.c
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nsec3param.c
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/*
* Part of DNS zone file validator `validns`.
*
* Copyright 2011-2014 Anton Berezin <tobez@tobez.org>
* Modified BSD license.
* (See LICENSE file in the distribution.)
*
*/
#include <ctype.h>
#include <sys/types.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"
struct rr *nsec3param = NULL;
static struct rr* nsec3param_parse(char *name, long ttl, int type, char *s)
{
struct rr_nsec3param *rr = getmem(sizeof(*rr));
struct rr *ret_rr;
int i;
i = extract_integer(&s, "hash algorithm");
if (i < 0)
return NULL;
if (i > 255)
return bitch("bad hash algorithm value");
if (i != 1)
return bitch("unrecognized or unsupported hash algorithm");
rr->hash_algorithm = i;
i = extract_integer(&s, "flags");
if (i < 0)
return NULL;
if (i > 255)
return bitch("bad flags value");
if (i != 0)
return bitch("flags is supposed to be 0 for NSEC3PARAM");
rr->flags = i;
i = extract_integer(&s, "iterations");
if (i < 0)
return NULL;
if (i > 2500)
return bitch("bad iterations value");
rr->iterations = i;
/* TODO validate iteration count according to key size,
* as per http://tools.ietf.org/html/rfc5155#section-10.3 */
if (*s == '-') {
rr->salt.length = 0;
rr->salt.data = NULL;
s++;
if (*s && !isspace(*s) && *s != ';' && *s != ')')
return bitch("salt is not valid");
s = skip_white_space(s);
} else {
rr->salt = extract_hex_binary_data(&s, "salt", EXTRACT_DONT_EAT_WHITESPACE);
if (rr->salt.length <= 0)
return NULL;
if (rr->salt.length > 255)
return bitch("salt is too long");
}
if (*s) {
return bitch("garbage after valid NSEC3PARAM data");
}
G.dnssec_active = 1;
ret_rr = store_record(type, name, ttl, rr);
if (ret_rr && !nsec3param && (ret_rr->rr_set->named_rr->flags & NAME_FLAG_APEX))
nsec3param = ret_rr;
if (G.opt.policy_checks[POLICY_NSEC3PARAM_NOT_APEX] &&
(ret_rr->rr_set->named_rr->flags & NAME_FLAG_APEX) == 0)
{
return bitch("NSEC3PARAM found not at zone apex");
}
return ret_rr;
}
static char* nsec3param_human(struct rr *rrv)
{
RRCAST(nsec3param);
char ss[1024];
char *s = ss;
int l;
int i;
l = snprintf(s, 1024, "%u %u %u ", rr->hash_algorithm, rr->flags, rr->iterations);
s += l;
if (rr->salt.length) {
for (i = 0; i < rr->salt.length; i++) {
l = snprintf(s, 1024-(s-ss), "%02X", (unsigned char)rr->salt.data[i]);
s += l;
}
} else {
sprintf(s, "-");
}
return quickstrdup_temp(ss);
}
static struct binary_data nsec3param_wirerdata(struct rr *rrv)
{
RRCAST(nsec3param);
return compose_binary_data("112b", 1,
rr->hash_algorithm, rr->flags,
rr->iterations, rr->salt);
}
struct rr_methods nsec3param_methods = { nsec3param_parse, nsec3param_human, nsec3param_wirerdata, NULL, NULL };